ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c%28cc%28n1%29C%29CCN3CCN%28c2cc%28ccc2%29C%29CC3/file?format=sdf&get3d=True  -- n1c%28cc%28n1%29C%29CCN3CCN%28c2cc%28ccc2%29C%29CC3 could not be loaded.